【摘要】 以粉煤灰和废砖为主要原料,碳酸钠为发泡剂,硼砂为助熔剂制备多孔建筑材料。分析了生坯成型工艺及粉煤灰、废砖粉配比对材料形貌与性能的影响。结果表明,相较于"压块法","铺料法"工艺制备出的样品发泡膨胀程度高、体积密度低。随着废砖粉掺量的增加,样品孔径趋于均匀,但过多的废砖粉会导致熔体液相黏度过小,出现塌陷、部分气泡合并与溢出的情况,使样品的体积密度过大,同时过多的废砖粉通过影响样品的晶相组成与含量降低抗压强度。在粉煤灰与废砖粉质量配比为50∶50的情况下,采用"铺料法"制备出的样品发泡与烧结程度良好,孔径均匀,体积密度为1.313 g/cm~3、抗压强度为18.25 MPa,综合性能优于泡沫玻璃和黏土砖,与高密度泡沫混凝土相近。更多还原

【Abstract】 Porous building materials were prepared with fly ash and waste brick as main raw materials, sodium carbonate as foaming agent and borax as fluxing agent. The influences of the green bodies forming process and the ratio of fly ash to waste brick powder on the morphology and performance of the materials were analyzed. The results show that, compared with the “pressing method”, the sample prepared by the “laying method”has a higher degree of foaming expansion and a lower bulk density. With the increase of waste brick powder content, the pore size of the sample tends to be uniform, but too much waste brick powder will lead to too small liquid viscosity of the melt, collapse, and some bubbles merge and overflow, so that the bulk density of the sample is too large. At the same time, too much waste brick powder reduces the compressive strength of the sample by affecting the crystal phase composition and content of the sample. When the mass ratio of fly ash and waste brick powder is 50∶50, the samples prepared by the “paving method” have good foaming and sintering degree, uniform pore size, bulk density of 1.313 g/cm~3, compressive strength of 18.25 MPa. The comprehensive properties are better than those of foam glass and clay brick, and similar to those of high density foam concrete.更多还原